Worcester have signed Northampton forward Ed O'Donoghue on a one-year deal as they look to build on their first season in the Premiership.
The 22-year-old, who can play at lock or blindside flanker, struggled for first-team rugby with Northampton.
Meanwhile, fly-half Tommy Hayes has left Worcester to join Bristol on a two-year contract.
Full-back Sean Marsden, Bristol's all- time league try-scoring record holder, has also signed an extension.
O'Donoghue only played four times for Northampton last season, but director of rugby John Brain was impressed with his contribution against Worcester.
Brain also consulted fly-half Shane Drahm, another Worcester close-season signing from Northampton.
"We spoke to Shane about Ed when we signed him and he cannot believe that he's played so little," said Brain.
"When we were watching Northampton early last season, this guy came on and made a big impact.
"I think he has the potential to be a very good signing for us."
O'Donoghue is Worcester's sixth signing for next season following the arrival of Drahm, Andy Gomarsall, Chris Fortey, Nicolas Le Roux and Emiliano Bergamaschi.